The C-factor, which is the ratio between bonded and non-bonded surfaces, has been found to have an effect on the bonding of fiber posts to root canal dentin. Studies have shown that a high C-factor, such as in the post hole, can lead to lower bond strength of the adhesive system to root canal dentin [3].

However, the use of intracanal medicaments such as CH, CH+CHX, and TAP have been found to enhance the pull-out bond strength of fiber posts to root canal wall as compared to the control group [1].

Other factors that have been found to influence the interfacial bond between fiber posts and root canal dentin include resin volume, adhesive system, root canal region, and the use of Er,Cr:YSGG laser irradiation [2][4][5].

Additionally, treatments such as Er:YAG laser irradiation with/without EDTA and the use of MTA have been found to enhance the bond strength of fiber posts to root canal dentin walls [7][6].

The effect of root canal irrigants such as CH and SH on the push-out bond strength of fiber posts cemented with an etch-and-rinse resin cement has also been studied, with CH showing a higher bond strength compared to SH [8].

Here are the references

[1] (2019). Effect of Intracanal Medicaments on Pull-Out Bond Strength of Fiber Post Cemented with a Self-Adhesive System. Eur J Dent, 03(13), 420-425. https://doi.org/10.1055/s-0039-1694313 [2] (2011).

Effects of C-factor and resin volume on the bonding to root canal with and without fibre post insertion. Journal of Dentistry, 6(39), 422-429. https://doi.org/10.1016/j.jdent.2011.03.007 [3] (2009).

Effect of relining on fiber post retention to root canal. J. Appl. Oral Sci., 6(17), 600-604. https://doi.org/10.1590/s1678-77572009000600012 [4] (2015).

Effect of Resin Cement Pre-heating on the Push-out Bond Strength of Fiber Post to Root Canal Dentin. J Dent Res Dent Clin Dent Prospects, 4(9), 233-238. https://doi.org/10.15171/joddd.2015.042 [5] (2012).

Effect of Er,Cr:YSGG pretreatment on bond strength of fiber posts to root canal dentin using a self-adhesive resin cement. Lasers Med Sci, 1(28), 65-69. https://doi.org/10.1007/s10103-012-1063-x [6] (2016).

Does MTA affect fiber post retention in repaired cervical root canal perforations?. Braz. oral res., 1(30). https://doi.org/10.1590/1807-3107bor-2016.vol30.0083 [7] (2013).

Efficacy of different treatments of root canal walls on the pull-out bond strength of the fiber posts. Lasers Med Sci, 2(30), 863-868. https://doi.org/10.1007/s10103-013-1457-4 [8] (2021).

Effect of Calcium Hypochlorite and Sodium Hypochlorite as Root Canal Irrigants on Push-Out Bond Strength of Fiber Post Cemented with Etch-and-Rinse Resin Cement: An In Vitro Study. fid. https://doi.org/10.18502/fid.v18i18.6325